$102.00 to install my rail on your top cover. Top Cover has a .010 deep pad milled on it so the rail is parallel to your barrel. No other modifications to your Top Cover, still works as it did prior to the rail installation. The rail is fastened by two grade eight 10-32 tapered shank flat head screws. 3/8 to 5/8" tall rail available. The Higher than 5/8" so you can use peep sights and the optics mounted on the rail available, quote upon request. All manufacturing is on CNC mills. Includes shipping UPS back to you. Mini UZI rails available as well. Finish on the rail is a baked on Flat Black Teflon paint.